So … you don’t think there were Terror Birds? You don’t even believe bones in the earth mean ANY thing?
Below is an image of a Terror Bird feeding on something around the size of a large deer … The point of my post was to explain that the speed with which a species can use normal mutation rates to survive new circumstances is LIMITED. And if a new predator or competitor suddenly arrives on the scene (in this case because South and North America were suddenly JOINED via Panama) … SOME SPECIES WILL PERISH.
Ask yourself this, John, what if Elephants were MEAT EATERS? What if tigers were the SIZE of ELEPHANTS?